单项选择题

A．About 50 kilometers.
B．Several hundred kilometers.
C．A certain height.
D．From the starting point back to the earth.
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单项选择题
A．They could drive the insects away.B．They could keep the plants well-watered.C．They could make the plants grow faster.D．They could build devices to trap insects.
A．They could drive the insects away.
B．They could keep the plants well-watered.
C．They could make the plants grow faster.
D．They could build devices to trap insects.
单项选择题
If you can make something that is timeless, then its appeal must derive more from merit and less from fashion.
A．Y
B．N
C．NG
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